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Investments - Schedule of Information About Investments (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Short-term |  |  |
Investments short term | $ 705,108 | $ 483,002 | $ 480,233
Long-term |  |  |
Investments long term | 65,953 | 953 | $ 861
Time deposits between 90 and 365 days [member] |  |  |
Short-term |  |  |
Time deposits between 90 and 365 days | 705,108 | 483,002 |
Time deposits of more than 365 days [member] |  |  |
Long-term |  |  |
Time deposits of more than 365 days | $ 65,953 | $ 953 |

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- Definition Short term deposits. + References No definition available. + Details
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- Definition The amount of long-term deposits held by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of non-current investments other than investments accounted for using the equity method. [Refer: Investments accounted for using equity method; Non-current assets; Investments other than investments accounted for using equity method] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of short-term deposits held by the entity that are not classified as cash equivalents. [Refer: Cash equivalents] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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